Process of producing metal peroxids.



' known that these peroxids can also be obtained by the the Kingdom of Prussia and Empire oi Germany, have ing these characteristics, the sodium peroxid is, owing to its cheapness, better suited for use as a starting mate- UNITED STATES PATENT OFFICE.

FRANZ FUHRMANN, OF. BERLIN, GERMANY, ASSIGNOR TO KIROHHOFF & NEIRATH BERLIN AMERICAN COMMERCIAL COMPANY, OF BERLIN, GERMANY, A FIRM.

PROCESS OF PRODUCING METAL PEROXI DS.

Specification of Letters Patent.

Patented .l'uly so, 1907.

Application filed June 14, 1905. Serial No. 265,272; (Specimens) To all whom it may concern:

Be it knownthat I, FRANZ FUHRMANN, Ph. D., a citizen of the Empire of Germany, residing in Berlin, in

invented certain new and useful Improvements in Processes of Producing Metal Peroxide, of which the following is a specification. I

This invention relates to an improved process of producing .highgrade and .chemically pure metalperoxids.

It is well known that the peroxide of the earth-alkali and heavy metals can be readily produced v by the action of hydrogen peroxid of a' high percentage on'the salts of said metals under addition of an alkali, as for instance ammonia. This process possesses the advantage that the peroxids, when produced by the use of the corresponding safety-measures, such as cooling, etc., are obtained mostly as easily filtering, granulous precipitates which are chemically pure and contain a high percentage of hydrogenperoxid. It is further well direct action of sodium peroxid on the corresponding metal-salts. But the products obtained by the latter process are mostly of a viscid, badly filtering character and readily inclined to decomposition. Notwithstand-' rial than. the hydrogen peroxid of high percentage, which, owing to its high price, is precluded for this purpose.

The present invention consists of a process of making chemically-pure metal peroxids by which all the advantages of hydrogen peroxid are also obtained when sodium peroxid is used as the starting material, and which consists in combining sodium peroxid gradually with a strong inorganic or organic acid, and permitting the'so-obtained solution of hydrogen peroxid of a high percentagewith a sodium-salt to act on salts of metal in presence of an alkali, as for instance ammonia. The" presence of the neutral sodium-salt does not impair the reaction. In place of the metal-salt and ammonia, the corresponding freshly-precipitated hydroxid or oxid of the metal can be used inasmuch as this is obtained primarily from a metal salt and an alkali. In this manner it is easily possible to produce in dn'e'operation hydrogen peroxid from sodium peroxid, and by the action of the former on metal-salts the formation of the corresponding peroxid is the final product. The resulting products are fine, granular and easily filtering precipitates, which, owing to their chemical puritys m'e not inclined to decomposition in the samemai'iner as the viscid products which are obtained by the direct action of sodium peroxid on metal-salts, and which can furthermore be produced by the use of the well known simple filtering and drying appliances. This produces not only a considerable saving in the apparatus required, butalso an important-technical and economical effect for the reason that in place of the expensive concentrated hydrogen superoxid the cheap sodium peroxid can be used as the starting substance.

The following examples are intended -to illustrate the carrying out of the process in practice:

Example I. (For magnesium perozigl). 30 kg. of hy- I peroxid are then slowly added to the solution until neutralization of the same takes placef lare has to be taken that the temperature is not raised to too great an extent. After again cooling the solution 22kg. of a saturated solution of magnesium chlorid is added and then under continuous stirring and cooling 17 kg. ammonia (25%). After the solution has been standing about an hour, the precipitate is filtered off, washed and slowly dried; then gain carefully washed and dried. 3

Example II. (For ziac peroxicl). In place of the magnesium chlorid solution of the first example 13.6

'kg. of zinc chlorid (free of water) are dissolved in 10 liters of water and then treated in the same manner as in Example I..

Example III. (For calcium perozid). 8 kg. of sodium peroxid are mixed with .30 kg. of hydrochloric acid and 10 liters of water, after which a sufficient quantity of milk of lime corresponding to 7.6kg. Ca(OH) is added, then permitted to stand, then filtered and Or a quantity of concentrated solution of calcium chlorid solution corresponding to 11.1 kg. calcium chlorid (CaCl is added, then 17 kg. of ammonia, the resulting solution being then treated as in Example 1.

Having thus described iny invention, I claim as new and desire to secure by Letters Patent: D

1. The process herein described of producing a-con-' centrated easily-filtering and chemically pure metal per;

oxid from sodium peroxid, which ,consists in dissolving sodium peroxid in a strong acid, and then causing the hydrogen peroxid so formed to be. acted on by a nietal hydroxld.

2. The process herein described of producing a concentratedeasily-filtering and chemically pure metal peroxid from sodium peroxid, which eonsisis in dissolving sodium peroxid in a strong acid, and then causing {he hydrogen peroxid so formed to be acted on by :1 metal oxid lorniinp; mum] hydroxid on being" introduced into the solution. 1

3. The process h rein described of producing a concenn-uted eusiiy-fillvermg and chemically pure metni 'per oxid from sodium peroxid, which consists in dissolving sodium p'eroxid in a strong acid, and then causing the 10 hydrogen peroxid so formed to be acted on by a metal salt in presence of an alkali both forming hydrdxid on being introduced into the solution.

In testimony, that I lnim the foregoing as my invention, I have signed my -name in presence of two s'ubscril mg witnesses.

' FRANZ FUHnMANN.

Witnesses:

Wonnmun H m-2'15, HENRY. HAsPEm 

